PRODUCT SUPPORT PROGRAM FOR REPLACING THE 178-8973 SECOND REDUCTION FINAL DRIVE BEARINGS ON CERTAIN 797B AND 797F OFF-HIGHWAY TRUCKS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REPLACING THE 178-8973 SECOND REDUCTION FINAL DRIVE BEARINGS ON CERTAIN 797B AND 797F OFF-HIGHWAY TRUCKS

Usage:

REBE6268-01

Show/hide table

01Aug2011

(Revised 08Dec2011)

U-314

A-264

D-283

Show/hide table

*After Failure Only*	PRODUCT SUPPORT PROGRAM FOR REPLACING THE 178-8973 SECOND REDUCTION FINAL DRIVE BEARINGS ON CERTAIN 797B AND 797F OFF-HIGHWAY TRUCKS
4084 4050		PS52061

Show/hide table

NOTE:

This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS52061" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.

Show/hide table

NOTE:

The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.

Show/hide table


NOTE:	This Revised Service Letter replaces the 01Aug2011 Service letter. Changes have been made to the Parts Needed quantity.

Show/hide table

TERMINATION DATE

31Aug2014

PROBLEM

Show/hide table

The existing 178-8973 Bearing As. (Second Reduction) can fail on certain 797, 797B and 797F Off-Highway Trucks. If the existing 178-8973 Bearing As. fails it can cause more extensive damage to the Wheel Group.

AFFECTED PRODUCT

Show/hide table

Model	Identification Number
797	5YW00193-00277
797B	JSM00123-00488
797F	LAJ00141-00255

PARTS NEEDED

Show/hide table

Qty	Part Number	Description
58	8T0283	BOLT-HEX HEAD
1	1131700	SEAL-O-RING
1	1438729	SEAL-O-RING
8	3340229	BEARING-ROLLER
4	3594284	GEAR-PLANET
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 2% of dealership population. This is an initial order recommendation only, and the ultimate responsibility for ordering the total number of parts needed to satisfy the program lies with the dealer.

ACTION REQUIRED

Show/hide table

Continue to monitor magnetic plug and take SOS samples as per OMM requirements. If SOS has high Fe and/or debris is on the plug take appropriate action. If the 178-8973 second reduction bearing assembly has failed, replace all 178-8973 Bearing Assemblies in the second reduction planetary carrier assembly with the 334-0229 Bearing Assemblies. The 359-4284 Planet Gear is to be used to replace only those gears that do not pass SEBF8193 Reusability Guidelines. Any gear that contains a failed bearing should be replaced.

Flushing of the differential and final drives to remove debris is required. The recommended target for cleanliness is ISO 18/15 or cleaner after any of the following activities: repair, rebuild and preventive maintenance. (Reference: SEPD0637 Service Magazine Change in Oil Change Interval for the Final Drive and the Rear Axle in Off-Highway Trucks)

Show/hide table

SERVICE CLAIM ALLOWANCES

Show/hide table

Product smu/age whichever comes first	Caterpillar		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
0-18000 hrs, 0-36 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%

Show/hide table

NOTE: This is a 120.0-hour job If there has been a previous repair, part age/hours will apply. Retain a copy of the previous repair invoice in the dealer's records for audit purposes, and specify repair date and machine hours in the "Additional Comments" section of the warranty claim.
NOTE: A total of 2 claims are allowed per machine serial number. NOTE: SMU/age ranges shown are parts hours not machine hours. NOTE: Second reduction bearings that have failed as a result of the failure of other related components are not allowed under this Service Letter.

Show/hide table